PP. Partido Popular. People's Party, Current leader (2008) Mariano Rajoy. The People's Party is a conservative and the main party of the centre-right in Spain. It is the second of the two major political parties in Spain, the other being the socialist PSOE. The PP is a member of the International Democrat Union, the Christian Democrat International and the European People's Party (EPP). The current leader of the PP in Catalonia is Josep Piqué